Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.

· · 来源：dev资讯

This story was originally featured on Fortune.com

Williams leads supergroup in Brits tribute to Ozzy

金戈铁马 驰骋东西（上新了），详情可参考谷歌浏览器【最新下载地址】

▲ 传统防窥膜结构，图片来自@上海复瞻智能科技

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The fan from west Yorkshire says flying to the Czech Republic with her friends would be unaffordable.